add `needs-ci` label for PRs made modifying `tools/` in core repo

[DerekNonGeneric]

This was requested by @BridgeAR in nodejs/node#41102, but had not yet been fully resolved by the PR that closed that issue. I have not contributed to this repo in a while, but I may be able to handle it here if there is any interest in getting this taken care of here.

/cc @Trott @aduh95

[DerekNonGeneric]

I will have to put this off until a fully-green CI can be made achieveable even once.

The master branch appears to be currently making good progress towards that goal.

[phillipj]

Hi @DerekNonGeneric,

automagic PR labelling was indeed done by this project for years. That was changed earlier this year tho, by moving that responsibility into a GitHub Action instead: nodejs/node-pr-labeler.

Main goal by doing so was to move the logic related to file path -> label into the project using the GitHub Action, instead of inside the GitHub Action project (or github-bot). For nodejs/node that configuration lives in: nodejs/node/.github/label-pr-config.yml.

Bottom line: I think what you're asking will be solved by changing the above configuration file inside nodejs/node.

Let me know if you need some help getting there :)